diff --git a/common/tool/tool_event.cpp b/common/tool/tool_event.cpp
index a54369cb63..55059a08e0 100644
--- a/common/tool/tool_event.cpp
+++ b/common/tool/tool_event.cpp
@@ -30,6 +30,12 @@
 #include <tool/tool_manager.h>
 #include <tool/actions.h>
 
+#ifdef WX_COMPATIBILITY
+#include <wx/debug.h>
+#else
+#include <cassert>
+#endif
+
 struct FlagString
 {
     int flag;
@@ -67,6 +73,18 @@ void TOOL_EVENT::init()
 }
 
 
+VECTOR2D TOOL_EVENT::returnCheckedPosition( const VECTOR2D& aPos ) const
+{
+#ifdef WX_COMPATIBILITY
+    wxCHECK_MSG( HasPosition(), VECTOR2D(), "Attempted to get position from non-position event" );
+#else
+    assert( HasPosition() );
+#endif
+
+    return aPos;
+}
+
+
 bool TOOL_EVENT::IsAction( const TOOL_ACTION* aAction ) const
 {
     return Matches( aAction->MakeEvent() );
diff --git a/include/tool/tool_event.h b/include/tool/tool_event.h
index 6908e3c7d5..359ea4acbd 100644
--- a/include/tool/tool_event.h
+++ b/include/tool/tool_event.h
@@ -34,12 +34,6 @@
 #include <math/vector2d.h>
 #include <core/optional.h>
 
-#ifdef WX_COMPATIBILITY
-#include <wx/debug.h>
-#else
-#include <cassert>
-#endif
-
 
 class TOOL_ACTION;
 class TOOL_MANAGER;
@@ -520,17 +514,7 @@ private:
      * @param aPos the position to return if the event is valid
      * @return the checked position
      */
-    VECTOR2D returnCheckedPosition( const VECTOR2D& aPos ) const
-    {
-    #ifdef WX_COMPATIBILITY
-        wxCHECK_MSG( HasPosition(), VECTOR2D(),
-            "Attempted to get position from non-position event" );
-    #else
-        assert( HasPosition() );
-    #endif
-
-        return aPos;
-    }
+    VECTOR2D returnCheckedPosition( const VECTOR2D& aPos ) const;
 
     TOOL_EVENT_CATEGORY m_category;
     TOOL_ACTIONS m_actions;